Nail gun



FIG. 1 is a top, rear, and left side perspective view of a nail gun showing our new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevation view thereof; and,

FIG. 7 is a front elevation view thereof.

The broken lines in the drawings illustrate portions of the nail gun that form no part of the claimed design. 

CLAIM The ornamental design for a nail gun, as shown and described. 